28890697 has 16 divisors (see below), whose sum is σ = 33451200. Its totient is φ = 24675840.

The previous prime is 28890683. The next prime is 28890703. The reversal of 28890697 is 79609882.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28890697 - 2¹¹ = 28888649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28890697.

It is not an unprimeable number, because it can be changed into a prime (28890647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28129 + ... + 29137.

It is an arithmetic number, because the mean of its divisors is an integer number (2090700).

Almost surely, 2^28890697 is an apocalyptic number.

It is an amenable number.

28890697 is a deficient number, since it is larger than the sum of its proper divisors (4560503).

28890697 is a wasteful number, since it uses less digits than its factorization.

28890697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1176.

The product of its (nonzero) digits is 435456, while the sum is 49.

The square root of 28890697 is about 5375.0066976702. The cubic root of 28890697 is about 306.8452041398.

The spelling of 28890697 in words is "twenty-eight million, eight hundred ninety thousand, six hundred ninety-seven".